1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /* drivers/mtd/maps/plat-ram.c
4  * (c) 2004-2005 Simtec Electronics
8  * Generic platform device based RAM map
20 #include <linux/mtd/mtd.h>
21 #include <linux/mtd/map.h>
22 #include <linux/mtd/partitions.h>
23 #include <linux/mtd/plat-ram.h>
27 /* private structure for each mtd platform ram device created */
31 	struct mtd_info		*mtd;  member
50  * to = 0 => read-only
51  *    = 1 => read-write
56 	if (info->pdata == NULL)  in platram_setrw()
59 	if (info->pdata->set_rw != NULL)  in platram_setrw()
60 		(info->pdata->set_rw)(info->dev, to);  in platram_setrw()
72 	dev_dbg(&pdev->dev, "removing device\n");  in platram_remove()
77 	if (info->mtd) {  in platram_remove()
78 		mtd_device_unregister(info->mtd);  in platram_remove()
79 		map_destroy(info->mtd);  in platram_remove()
82 	/* ensure ram is left read-only */  in platram_remove()
102 	dev_dbg(&pdev->dev, "probe entered\n");  in platram_probe()
104 	if (dev_get_platdata(&pdev->dev) == NULL) {  in platram_probe()
105 		dev_err(&pdev->dev, "no platform data supplied\n");  in platram_probe()
106 		err = -ENOENT;  in platram_probe()
110 	pdata = dev_get_platdata(&pdev->dev);  in platram_probe()
114 		err = -ENOMEM;  in platram_probe()
120 	info->dev = &pdev->dev;  in platram_probe()
121 	info->pdata = pdata;  in platram_probe()
124 	info->map.virt = devm_platform_get_and_ioremap_resource(pdev, 0, &res);  in platram_probe()
125 	if (IS_ERR(info->map.virt)) {  in platram_probe()
126 		err = PTR_ERR(info->map.virt);  in platram_probe()
130 	dev_dbg(&pdev->dev, "got platform resource %p (0x%llx)\n", res,  in platram_probe()
131 		(unsigned long long)res->start);  in platram_probe()
135 	info->map.phys = res->start;  in platram_probe()
136 	info->map.size = resource_size(res);  in platram_probe()
137 	info->map.name = pdata->mapname != NULL ?  in platram_probe()
138 			(char *)pdata->mapname : (char *)pdev->name;  in platram_probe()
139 	info->map.bankwidth = pdata->bankwidth;  in platram_probe()
141 	dev_dbg(&pdev->dev, "virt %p, %lu bytes\n", info->map.virt, info->map.size);  in platram_probe()
143 	simple_map_init(&info->map);  in platram_probe()
145 	dev_dbg(&pdev->dev, "initialised map, probing for mtd\n");  in platram_probe()
147 	/* probe for the right mtd map driver  in platram_probe()
150 	if (pdata->map_probes) {  in platram_probe()
151 		const char * const *map_probes = pdata->map_probes;  in platram_probe()
153 		for ( ; !info->mtd && *map_probes; map_probes++)  in platram_probe()
154 			info->mtd = do_map_probe(*map_probes , &info->map);  in platram_probe()
158 		info->mtd = do_map_probe("map_ram", &info->map);  in platram_probe()
160 	if (info->mtd == NULL) {  in platram_probe()
161 		dev_err(&pdev->dev, "failed to probe for map_ram\n");  in platram_probe()
162 		err = -ENOMEM;  in platram_probe()
166 	info->mtd->dev.parent = &pdev->dev;  in platram_probe()
173 	err = mtd_device_parse_register(info->mtd, pdata->probes, NULL,  in platram_probe()
174 					pdata->partitions,  in platram_probe()
175 					pdata->nr_partitions);  in platram_probe()
177 		dev_err(&pdev->dev, "failed to register mtd device\n");  in platram_probe()
181 	dev_info(&pdev->dev, "registered mtd device\n");  in platram_probe()
183 	if (pdata->nr_partitions) {  in platram_probe()
185 		err = mtd_device_register(info->mtd, NULL, 0);  in platram_probe()
187 			dev_err(&pdev->dev,  in platram_probe()
204 MODULE_ALIAS("platform:mtd-ram");
210 		.name	= "mtd-ram",
218 MODULE_DESCRIPTION("MTD platform RAM map driver");